WASHINGTON (AP) - Her voice wavered, the emotion coming through loud and clear, as a California woman spoke of her son who committed suicide after using steroids. "There is no doubt in our minds that steroids killed our son," Denise Garibaldi told a House committee during Thursday's hearing on steroids in baseball. An hour or so later, Garibaldi and her husband were seated in the gallery directly behind Mark McGwire, one of Rob Garibaldi's baseball heroes. The young Garibaldi would tape McGwire on television and break down McGwire's swing "frame by frame," said father Raymond Garibaldi. The Garibaldis, of Petaluma,...